package types import ( "bytes" "errors" "fmt" "time" "github.com/tendermint/tendermint/crypto" tmbytes "github.com/tendermint/tendermint/libs/bytes" ) const ( // MaxVoteBytes is a maximum vote size (including amino overhead). MaxVoteBytes int64 = 223 nilVoteStr string = "nil-Vote" ) var ( ErrVoteUnexpectedStep = errors.New("unexpected step") ErrVoteInvalidValidatorIndex = errors.New("invalid validator index") ErrVoteInvalidValidatorAddress = errors.New("invalid validator address") ErrVoteInvalidSignature = errors.New("invalid signature") ErrVoteInvalidBlockHash = errors.New("invalid block hash") ErrVoteNonDeterministicSignature = errors.New("non-deterministic signature") ErrVoteNil = errors.New("nil vote") ) type ErrVoteConflictingVotes struct { *DuplicateVoteEvidence } func (err *ErrVoteConflictingVotes) Error() string { return fmt.Sprintf("conflicting votes from validator %X", err.VoteA.ValidatorAddress) } func NewConflictingVoteError(val *Validator, vote1, vote2 *Vote) *ErrVoteConflictingVotes { return &ErrVoteConflictingVotes{ NewDuplicateVoteEvidence(vote1, vote2), } } // Address is hex bytes. type Address = crypto.Address // Vote represents a prevote, precommit, or commit vote from validators for // consensus. type Vote struct { Type SignedMsgType `json:"type"` Height int64 `json:"height"` Round int `json:"round"` BlockID BlockID `json:"block_id"` // zero if vote is nil. Timestamp time.Time `json:"timestamp"` ValidatorAddress Address `json:"validator_address"` ValidatorIndex int `json:"validator_index"` Signature []byte `json:"signature"` } // CommitSig converts the Vote to a CommitSig. func (vote *Vote) CommitSig() CommitSig { if vote == nil { return NewCommitSigAbsent() } var blockIDFlag BlockIDFlag switch { case vote.BlockID.IsComplete(): blockIDFlag = BlockIDFlagCommit case vote.BlockID.IsZero(): blockIDFlag = BlockIDFlagNil default: panic(fmt.Sprintf("Invalid vote %v - expected BlockID to be either empty or complete", vote)) } return CommitSig{ BlockIDFlag: blockIDFlag, ValidatorAddress: vote.ValidatorAddress, Timestamp: vote.Timestamp, Signature: vote.Signature, } } func (vote *Vote) SignBytes(chainID string) []byte { bz, err := cdc.MarshalBinaryLengthPrefixed(CanonicalizeVote(chainID, vote)) if err != nil { panic(err) } return bz } func (vote *Vote) Copy() *Vote { voteCopy := *vote return &voteCopy } func (vote *Vote) String() string { if vote == nil { return nilVoteStr } var typeString string switch vote.Type { case PrevoteType: typeString = "Prevote" case PrecommitType: typeString = "Precommit" default: panic("Unknown vote type") } return fmt.Sprintf("Vote{%v:%X %v/%02d/%v(%v) %X %X @ %s}", vote.ValidatorIndex, tmbytes.Fingerprint(vote.ValidatorAddress), vote.Height, vote.Round, vote.Type, typeString, tmbytes.Fingerprint(vote.BlockID.Hash), tmbytes.Fingerprint(vote.Signature), CanonicalTime(vote.Timestamp), ) } func (vote *Vote) Verify(chainID string, pubKey crypto.PubKey) error { if !bytes.Equal(pubKey.Address(), vote.ValidatorAddress) { return ErrVoteInvalidValidatorAddress } if !pubKey.VerifyBytes(vote.SignBytes(chainID), vote.Signature) { return ErrVoteInvalidSignature } return nil } // ValidateBasic performs basic validation. func (vote *Vote) ValidateBasic() error { if !IsVoteTypeValid(vote.Type) { return errors.New("invalid Type") } if vote.Height < 0 { return errors.New("negative Height") } if vote.Round < 0 { return errors.New("negative Round") } // NOTE: Timestamp validation is subtle and handled elsewhere. if err := vote.BlockID.ValidateBasic(); err != nil { return fmt.Errorf("wrong BlockID: %v", err) } // BlockID.ValidateBasic would not err if we for instance have an empty hash but a // non-empty PartsSetHeader: if !vote.BlockID.IsZero() && !vote.BlockID.IsComplete() { return fmt.Errorf("blockID must be either empty or complete, got: %v", vote.BlockID) } if len(vote.ValidatorAddress) != crypto.AddressSize { return fmt.Errorf("expected ValidatorAddress size to be %d bytes, got %d bytes", crypto.AddressSize, len(vote.ValidatorAddress), ) } if vote.ValidatorIndex < 0 { return errors.New("negative ValidatorIndex") } if len(vote.Signature) == 0 { return errors.New("signature is missing") } if len(vote.Signature) > MaxSignatureSize { return fmt.Errorf("signature is too big (max: %d)", MaxSignatureSize) } return nil }